Maurice,

Steve White is probably the most relevant the guru on early GRP boats,  and certainly he has rebuilt the mast step for at least one of them.

I hope to get down to the club tomorrow,  and may be able to photograph and take measurements from an early boat (probably Mk 2),  but I am not sure that this is a great deal of help to you,  since there is no guarantee that anything on that boat will necessarily be still original and correct!    We all know that it is a block (wooden in the Mark 1 or 2 boats,  GRP for many of the mark 3 boats) with a rectangular (approx square) mortise approx. 3″ square,  sitting just ahead of the centreboard case,  but I gather that you want more precise details than that.

I presume that there is some good reason why you cannot just take the dimensions and location from the old one before you remove it?

Oliver

Hi Maurice

I think you will get the technical detail from the members’ section, Class rules page 4B, GRP hulls previous to 13115. items 3.4 & 3,5 which add detail to Oliver’s comments. Interestingly it makes no mention of the thickness (height) of the block Oliver describes, nor of the depth of the mortice.  Leave sufficient thickness beneath the mast foot to take the loading of the rig tension, probably 15mm of good hard wood.  Allow channels for drainage and coat with epoxy.  Make the “square” a snug fit for your mast foot, the 90 mm is for wooden masts.

Norman

• This reply was modified 6 years, 1 month ago by norman.

Norman,

Thanks for that;  however I think you mean the Measurement Form page 4B,  with the references which you then quote,  rather than the Class Rules.     Both are on this site.

Regards,

Oliver